Palmer amaranth in a cotton field (photo: Ohio State University Extension)

In the 1970s, Monsanto introduced a new chemical to kill weeds. Known commonly as Roundup, it was capable of killing whatever weed got in its way. Seed companies later developed varieties of plants that were immune to Roundup’s killing power, enabling farmers to use one herbicide—Roundup—for all their crops.

Now, to put the problem in a nutshell: “You’ve heard of this guy called Chuck Darwin and evolution?” as Iowa State University agronomy professor Mike Owen put it to The Des Moines Register.

The herbicide, also known as glyphosate, became so ubiquitous in American agriculture that eventually Mother Nature started producing new weeds—16 so far—immune to the chemical. There are now enough glyphosate-resistant weeds in America to nearly cover the state of Oregon, Michael Wines reported at The New York Times.

Take the weed Palmer amaranth. It started showing up in cotton fields in the South, and before farmers knew it, it was everywhere. It can grow higher than six feet tall and spread a million seeds from each plant. Roundup was useless against it, leaving farmers the choice of pulling the weed by hand or using more powerful herbicides that could kill crops as well.

Some of the blame for the spread of Roundup-resistant weeds goes to farmers, who have ignored traditional methods of crop diversification. “Even though we warned them, you understand the economics behind it,” Robert Hartzler, another ISU professor of agronomy, told The Register.

Some farmers are now growing different crops and making sure their tractors and combines are free of Palmer amaranth debris and seeds before moving them from one field to another.

Comments

m.weiss
3 years ago

amaranth was the staple grin of the Incas. why not just grow it and omit herbicides? synergy.

Roch
3 years ago

This is profit driven, let's not blame the farmer who was lied to and told it 'was harmless' stuff. Of course common sense tells otherwise, but such is life in America. GMO reduce male testosterone levels. How about just blaming Monsanto who sues farmers
if they have some GMOgarbage blown in by the wind?